Patents by Inventor Burton M. Rein

Burton M. Rein has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Battery separator
    Patent number: 5281491
    Abstract: The present invention is directed to a multi-ply unfilled microporous sheet product composed of at least one first ply and at least one second ply which are, respectively, formed from polymeric compositions having different rheological properties and to a method of forming said sheet product.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: January 25, 1994
    Assignee: W. R. Grace & Co.
    Inventors: Burton M. Rein, Howard J. Troffkin, Robert M. Spotnitz, Richard T. Giovannoni, Yihong Guo
  • Process of making a battery separator
    Patent number: 5240655
    Abstract: A process of having a microporous multiply sheet product which is capable of becoming non-porous at a predetermined elevated transformation temperature is formed by first forming a non-porous, multiply initial sheet product having at least one first ply and at least one second ply, each with its own viscosity profile. The initial sheet product is then stretched and annealed to impart porosity to the sheet product.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: August 31, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Howard J. Troffkin, Burton M. Rein, Robert M. Spotnitz, Richard T. Giovannoni, Yihong Guo